Introducing the Trebuchet, a powerful siege equipment constructed by Engineers:
Usefull for taking out defenses or 'sniping' enemy Catapults. These should be used in any major siege or used against a player who's trying to siege you, as the Trebuchet can hit Catapults from a safe distance while your Guard Towers can't.

It has a long attack range, but cannot move. Attacks structures and mechanical units.

I'm aware that the Decomission tooltip text needs to be rewritten.
It should have said: "When the Trebuchet has served it's purpose there is no point in leaving this fine equipment behind. Decommissioning it will bring back 50% of it's gold cost."